This bug also occurs with Ubuntu 7.04 "Feisty Fawn" Beta. With APIC enabled (when my bios is reset back to factory defaults), attempts to boot Ubuntu 7.04 beta result in a reboot instead of booting just like prior versions of Ubuntu. Passing the kernel command line options "acpi=off" or "pci=noacpi" allow the boot to procede when APIC is enabled.
I will attach relevant logs from Ubuntu 7.04 beta's kernel. ** Also affects: linux-source-2.6.20 (Baltix) Importance: Undecided Status: Unconfirmed ** Also affects: linux-source-2.6.20 (Ubuntu) Importance: Undecided Status: Unconfirmed -- Boot fails with APIC enabled on an Asus A7V8X-X Motherboard https://launchpad.net/bugs/70774 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs